clk 320 misfire

I have a 2000 clk 320 that is showing a multiple cylinder misfire any
quick fixes I should try first before I spend the usual $1000 at the
stealership. I have had good luck with this car until now I cant seem to

Could be an Air mass sensor fault. It doesn't actually stop working but
gives a false reading. This causes the engine run weak.
Also seen alot of blocked cat's. This also gives multiple misfires.
Neither of the above are cheap.

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